Flickr/James TheophaneNo matter what time you tend to wake up, you probably know this fact about yourself: you're either a "morning person" or you're not.

You're a morning person if you wake up cheerfully ready to start the day. You're not if you use an alarm to help pry your eyelids open and your sense of humor, maybe even your whole personality, doesn't show up until some hours later.

New research from genetics testing company 23andMe implies that being a morning person or a night owl is, for many people, in your genes.

23andMe conducted a study of nearly 90,000 people who used its consumer genetics tests and the findings were published in the journal Nature Communications on Tuesday.

The genetics company asked people if they considered themselves morning people or night owls. It then looked at different variants of genes to see if any of them were linked to the trait of "morningness."

Morning people are significantly less likely to suffer from insomnia. Only 20% of them reported bouts of it, compared to nearly 40% of night owls.

Morning people are less likely to need more than 8 hours of sleep per night (43% said they did, compared to 53% of night owls).

Morning people are less likely to sleep walk (7% vs. 9%), too. And they are less likely to report sweaty sleep.

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Morning people also are more likely to have a lower body mass index (BMI), a measure of body fat based on height and weight. In other words, they tend to be thinner. However, 23andMe isn't saying that waking up early causes thinness, just that there seems to be a relationship there.